Earlier quoted context omitted.
If you're using business income to invest in yourself as an individual, that's pretty illegal where I live. Maybe it's different where you are. The extent to which I can invest in myself is using business supplies or equipment for personal tasks here and there. Like, print some things or use some software I didn't pay taxes on. I know some people go as far as driving their work vehicles around, but that's totally ill…
Check out Hess v Commissioner. For certain types of businesses the individual is almost indistinguishable from the business.
> The relevant ruling on this subject came in 1994 in a case known as Hess v. Commissioner. The plaintiff, a self-employed exotic dancer, had implants that expanded her bust size to the size 56FF. For tax purposes, she treated these as a deductible business expense on her schedule C. The IRS contested her deduction.
> ... The courts ruled in her favor:
https://taxfoundation.org/blog/how-breast-implant-size-relev...